CVS commit: src/sys/dev/ata

["Jaromir Dolecek" <jdolecek%netbsd.org@localhost>]

Module Name:    src
Committed By:   jdolecek
Date:           Mon Jan 13 21:20:17 UTC 2020

Modified Files:
        src/sys/dev/ata: wd.c

Log Message:
disable NCQ by default for "Samsung SSD 860 EVO 1TB" and
"Samsung SSD 860 EVO 500GB" - these drives have known broken NCQ support
particularly when used with AMD SB710/750 chipsets, problem occur also
under Linux and Windows

https://eu.community.samsung.com/t5/Cameras-IT-Everything-Else/860-EVO-250GB-causing-freezes-on-AMD-system/td-p/575813
https://bugzilla.kernel.org/show_bug.cgi?id=201693

It seems there is no Samsung firmware update to fix this even.

Disable NCQ regardless of the controller, it's likely same problem
exists with other controllers too.

This should fix PR kern/54790 and PR kern/54855


To generate a diff of this commit:
cvs rdiff -u -r1.453 -r1.454 src/sys/dev/ata/wd.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.